There are many night bars and massages in Bangkok that provide companions. Bangkok escort services in particular are not that popular because of over-saturation of female talent, but online escort agencies do exist and they are becoming more popular.

Bangkok Escort List
Local mall list of female escorts and Bangkok escort agencies with websites on the internet, some of whom are Bangkok massage parlors with outcall services. While there is no real need to use an online escort agency to find sexy company in Bangkok there are plenty of offers as this page provides urls and short descriptions.

BKK 141
Bangkok escort agency with a similar web appearance as Hong Kong's famous sex141 website. Thai girls look like average gogo girls, but they ask for much higher prices.

No. 1 BKK
Thai ladies for outcall in BKK. They offer attractive Bangkok escorts. It's the same kind of girls you can find in massage parlors all over town. Some of the images on their site appear to be fakes of Japanese porn stars. You may want to ask first if girls on images will be actual escorts. Good luck with Number one.

Gentlemen's Club
An escort agency in Bangkok. Order students and office type girls for outcall to your hotel or apartment. The premier Bangkok escort agency offers ladyboys as well.